Math Is Fun Forum
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#51 Re: Introductions » Hello Again! » 2008-12-22 17:03:06
I'll try to help anyone I can.
Where are you from careless25?
And year 11 is quite a challenge, year 11 up just doesn't get any easier I'm afraid:(
#52 Re: Coder's Corner » MNEMONICS. » 2008-12-22 14:26:58
We use
BODMAS here.
Oh and our specialist teacher made a mnemonic for sec, cosec and cot
CHOSHACTOA
cosect(H/O)
sec(H/A)
cot(O/A)
Don't know it its useful to others, but it works for me.
#53 Re: Dark Discussions at Cafe Infinity » Music; what's your song? » 2008-12-22 14:19:37
I really like Breaking Benjamin, I have for a long time, very nice band if your into rock.
I have recently been listening to Hinder
White_Wolf - If you like Nickelback you will definatly like Hinder, have a listen.
Note: If anyone on this forum wants a good website to listen to music, find similar artists or anything like that please try last.fm it really is great!
#54 Re: Jokes » Ghosts » 2008-12-22 14:17:01
Hahahaha, nice one ganesh
#55 Re: Guestbook » Don't Post here! » 2008-12-22 14:15:58
Algebra really isn't too difficult, constant revision is key to success but then I guess I can say that about ALL areas of maths:P
#56 Re: Introductions » About me.. » 2008-12-22 14:14:18
Hmmm, I live in Australia too, but its a bit hard to track down a Stephanie, as there are thousands of stephanies over here.
#57 Re: Help Me ! » How do i work out an average? » 2008-12-22 14:12:42
What I really like about this post is that it helped out not only the person with the problem but LOTS of other people who are signed up on this site or not. There has been 20596!!! views, it has helped many! good work everyone!
#58 Re: Maths Teaching Resources » Free Calculus Tutorial Videos » 2008-12-22 14:10:33
www.midnighttutor.com looks like a website I should check out for additional help with calculus, I see loads of vids!
#59 Re: Maths Is Fun - Suggestions and Comments » Forum Software has a v1.3 Beta » 2008-12-22 14:03:25
Chrome is supposed to be the new mozilla firefox.
Has anyone on the forums here tried it? if so, leave some feedback, I'd be interested to see the difference.
What are the differences careless? does it run the same? slower?
#60 Re: Formulas » Calculus (General) Formulas » 2008-12-22 13:14:20
Finding Derivatives By First Principles
f'(x)=lim f(x+h)-f(x)
h->0 -------------
h
#61 Re: This is Cool » Is it Possible to Circle a Square? Which is the Hardest Calculation? » 2008-12-22 13:10:47
Yes your right careless, that is how the IP addresses are calculated.
They all have different numbers, some differentiate between countries etc.
I think because too many computers have been added to the internet they also included something known as a default gateway it is used when the IP adress does not belong to any other entities.
#62 Re: Exercises » Logarithms - High school Level » 2008-12-22 13:05:22
Hmm that formula looks straightforward and useful!
thanks for that ganesh!
#63 Re: Maths Is Fun - Suggestions and Comments » Mathopolis » 2008-12-22 12:40:56
Hmm, the games are fun, they are good for improving mental arithmetic.
#64 Re: Help Me ! » Set Notation Help » 2008-12-22 12:36:23
Thanks so much mathsyperson, you couldn't have explained it any better.
Thats exactly what I needed, just needed clarification on certain things which you have provided.
Many thanks mate:)
oh as a side note.
can \ be reffered to as (not) that works for me some times.
Actually I thank that is true as I have seen R/{0} meaning R excluding 0 correct?
#65 Re: Help Me ! » Trigonometry help » 2008-12-22 12:33:19
Ah, you mean exact values?
we only know 0°, 30°, 45°, 60°, 90° we havn't been taught anything above, thats next year.
Thanks for the ongoing help ganesh, its much appreciated.
Actually Ganesh I see what I've been doing wrong I understand 100% now, thanks for putting up with my confusion.
#66 Re: Help Me ! » Trigonometry help » 2008-12-21 14:12:02
thanks for the fast reply ganish, much appreciated.
however, for question 1b)
If 2cos(2x)=-1 the answer is pi/3, 2pi/3, 4pi/3, 5pi/3 why is that?
and how are your deriving your answers in two steps, if there is a technique I'd really like to know, it would help alot.
#67 Re: Exercises » Logarithms - High school Level » 2008-12-21 13:57:47
and no I havn't careless, I've only been taught how to deal with same bases, nothing advanced. Next year we deal with e and I'm guessing we will also be taught the change of base formula.
#68 Help Me ! » Trigonometry help » 2008-12-20 18:38:25
- glenn101
- Replies: 8
Hi everyone, I'm stuck with these trig questions, I don't understand why some give more solutions than others over the required domain it just doesn't make sense to me.
I also need help with solving tan equations, I've never done them before I've just began next years specialist work early but the book doesn't explain it.
1. Solve each of the following for x element [0,2pi];
sinx=-root3/2
sintheta=pi/3
theta=pi/3, (2pi-pi/3), (pi+pi/3)
theta= pi/3, 4pi/3, 5pi/3
in the answer it is just
4pi/3, 5pi/3 why is that?? why isn't pi/3 a solution?
and
2cos(2x)=-1 0≤x≤2pi (not sure if this part is correct my maths teacher taught me it.)
cos(2x)= -1/2 0≤2x≤4pi
costheta=pi/3
theta=pi/3, (pi-pi/3), (pi+pi/3)
= 2pi/3, 4pi/3
the answer in the book is
pi/3, 2pi/3, 4pi/3, 5pi/3 this is really confusing me. Why do they now have the pi/3 and where do they get the 5pi/3 from?
2. Solve each of the following for x element[0,2pi];
a) 2tan(x/2)+2=0
2tan(x/2)=-2
tan(x/2)=-1
from there I just lose it.
Thanks in advance for any help,
Glenn.
#69 Help Me ! » Set Notation Help » 2008-12-20 18:08:35
- glenn101
- Replies: 3
Hi everyone, I'm just getting confused with several questions related to set notation, and set notation is something I have to know perfectly to score well this year, any help for this post would be much appreciated.
Can you please explain how you derive your answers.
1. For A={1,2,3,4,5,6,7,8,9,10}, B={2,4,6,8,10} and C={1,3,6,9}, find;
A\(B intersect C)=...
This question I don't understand at all, its not making any sense to me.
For each of the following, use one number line on which to represent the sets;
a) [-3,6], [2,4], [-3,6] intersect [2,4]
b) [-3,6], R\[-3,6]
c) [-2,∞), (-∞,6], [-2,∞) intersect (-∞,6]
d) (-8,-2), R(minus)\(-8,-2)
Thanks very much in advance,
Glenn.
Note: I still need help with this, I still am having trouble.
#70 Re: Help Me ! » Pyramids » 2008-12-20 17:57:35
Don't mention it careless, its good to know people care about helping others
#71 Re: Dark Discussions at Cafe Infinity » University Offer » 2008-12-20 17:49:28
Nice work Daniel123, I can't wait to go to uni.
I'm doing year 12 next year.
#72 Re: Exercises » Logarithms - High school Level » 2008-12-20 17:47:21
Thanks for the answers ganesh!
I havn't been taught those sorts of logs before, with surds and same bases.
Looks interesting.
Thanks again
#73 Re: Help Me ! » Actual difference between mutually exclusive and independent event » 2008-12-20 17:45:51
ok I'll put it as simple as I can.
Matually exclusive events occur if Pr(A intersect B)=null
Events A and B cannot happen at the same time. If A and B are mutually exc;isove. Pr(A intersect B)=0, so the Addition Law becomes:
Pr(A intersect B)= Pr(A)+Pr(B)
or
Pr(A or B)= Pr(A)+Pr(B)
hope that helps
#74 Re: Exercises » Logarithms - High school - II » 2008-12-20 17:41:11
It's good to see other people attempting these questions:)
They are very helpful for revising my maths, thanks ganesh!
#75 Re: Help Me ! » Pyramids » 2008-12-19 15:17:49
Thanks mathsy:D
I thought it was right, the teacher said there were errors with this booklet so thanks for that.